Bicycle Mechanics - Crankset Help

I have a Schwinn crosscut and unfortunately I have a couple teeth missing on my chain rings. Ive been looking for a reasonable priced replacement but Im not really sure what I should be looking for. I found one on jensonusa.com and wanted to know if it would work with my bike.

http://www.jensonusa.com/store/product/CR307A02-Shimano+Alivio+Fc-M410+Compact+Crank+Set.aspx

I just need something basic so if anyone has other recommendations Im open.

Oh yeah if your not sure what a crosscut is, its a 7 speed hybrid with drop down bars.

As you admittedly aren't quite sure what you need, wouldn't it be safer to have your shop handle everything for you? Pulling crankarms off requires a crank puller, and installing them is best done with a torque wrench, or you run the risk of having them fall off.

Also, if the chain is old or worn, it probably won't mesh very well with a new crankset. Meaning you'd need a new chain, which would (probably) mean replacing the rear cassette as well.

Do you have a 113mm wide bottom bracket which is specified for that crankset? Or, are you replacing the BB, too? Is your current crank mountain style like the Alivio? (22-32-42 rings)

Before you go changing things, how does it ride right now?

With teeth missing from a chain ring, it's time to change something.

bump

I'll mention this as a "just in case..." Make sure you're not mistaking "missing teeth" for the purposely shortened teeth on alot of chainrings that aid in shifting. Pictures always help.

The Schwinn Crosscut is a hybrid, but the drop-bars must have come later.

Oh the teeth definetly are worn down and/or missing on the middle chain wheel.lol when I go to pedal on that one its not a pretty site, when it first happened I almost fell into traffic. The current crankset is the original Shimano altus that came with the bike if that helps.